linux-kernel - Re: [PATCH v1] usb: typec: tcpm: Skip hard reset when in error recovery

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Date:   Wed, 8 Nov 2023 09:33:26 +0200
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Badhri Jagan Sridharan <badhri@...gle.com>
Cc:     gregkh@...uxfoundation.org, linux@...ck-us.net, kyletso@...gle.com,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        rdbabiera@...gle.com, amitsd@...gle.com, stable@...r.kernel.org
Subject: Re: [PATCH v1] usb: typec: tcpm: Skip hard reset when in error
 recovery

On Wed, Nov 01, 2023 at 02:19:09AM +0000, Badhri Jagan Sridharan wrote:
> Hard reset queued prior to error recovery (or) received during
> error recovery will make TCPM to prematurely exit error recovery
> sequence. Ignore hard resets received during error recovery (or)
> port reset sequence.
> 
> ```
> [46505.459688] state change SNK_READY -> ERROR_RECOVERY [rev3 NONE_AMS]
> [46505.459706] state change ERROR_RECOVERY -> PORT_RESET [rev3 NONE_AMS]
> [46505.460433] disable vbus discharge ret:0
> [46505.461226] Setting usb_comm capable false
> [46505.467244] Setting voltage/current limit 0 mV 0 mA
> [46505.467262] polarity 0
> [46505.470695] Requesting mux state 0, usb-role 0, orientation 0
> [46505.475621] cc:=0
> [46505.476012] pending state change PORT_RESET -> PORT_RESET_WAIT_OFF @ 100 ms [rev3 NONE_AMS]
> [46505.476020] Received hard reset
> [46505.476024] state change PORT_RESET -> HARD_RESET_START [rev3 HARD_RESET]
> ```
> 
> Cc: stable@...r.kernel.org
> Fixes: f0690a25a140 ("staging: typec: USB Type-C Port Manager (tcpm)")
> Signed-off-by: Badhri Jagan Sridharan <badhri@...gle.com>

Acked-by: Heikki Krogeus <heikki.krogerus@...ux.intel.com>

> ---
>  drivers/usb/typec/tcpm/tcpm.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 058d5b853b57..b386102f7a3a 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -5391,6 +5391,15 @@ static void _tcpm_pd_hard_reset(struct tcpm_port *port)
>  	if (port->bist_request == BDO_MODE_TESTDATA && port->tcpc->set_bist_data)
>  		port->tcpc->set_bist_data(port->tcpc, false);
>  
> +	switch (port->state) {
> +	case ERROR_RECOVERY:
> +	case PORT_RESET:
> +	case PORT_RESET_WAIT_OFF:
> +		return;
> +	default:
> +		break;
> +	}
> +
>  	if (port->ams != NONE_AMS)
>  		port->ams = NONE_AMS;
>  	if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
> 
> base-commit: c70793fb7632a153862ee9060e6d48131469a29c
> -- 
> 2.42.0.820.g83a721a137-goog

-- 
heikki